This is a wdspec test.
[FAIL] test_detached_shadow_root[top_context]
assert 500 == 404
[FAIL] test_detached_shadow_root[child_context]
assert 500 == 404
[FAIL] test_stale_element[top_context]
assert 500 == 404
[FAIL] test_stale_element[child_context]
assert 500 == 404
[FAIL] test_not_supported_nodes[attribute]
AssertionError: assert 200 == 500
[FAIL] test_not_supported_nodes[text]
AssertionError: assert 200 == 500
[FAIL] test_not_supported_nodes[processing_instruction]
AssertionError: assert 200 == 500
[FAIL] test_not_supported_nodes[comment]
AssertionError: assert 200 == 500
[FAIL] test_not_supported_nodes[document]
AssertionError: assert 200 == 500
[FAIL] test_not_supported_nodes[doctype]
AssertionError: assert 200 == 500
Harness: the test ran to completion.